| /* Copyright (C) 2007 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <math.h> |
| #include <math_ldbl_opt.h> |
| |
| |
| double |
| __round (double x) |
| { |
| const double almost_half = 0x1.fffffffffffffp-2; |
| const double two52 = 0x1.0p52; |
| double tmp, r; |
| |
| __asm ( |
| #ifdef _IEEE_FP_INEXACT |
| "addt/suic %2, %3, %1\n\tsubt/suic %1, %3, %0" |
| #else |
| "addt/suc %2, %3, %1\n\tsubt/suc %1, %3, %0" |
| #endif |
| : "=&f"(r), "=&f"(tmp) |
| : "f"(fabs (x) + almost_half), "f"(two52)); |
| |
| return copysign (r, x); |
| } |
| |
| weak_alias (__round, round) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__round, __roundl) |
| weak_alias (__roundl, roundl) |
| #endif |
| #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) |
| compat_symbol (libm, __round, roundl, GLIBC_2_1); |
| #endif |